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Creator
- W.W. Hixson & Co.830
- Walker, Alfred C.49
- Schmidt, James J.42
- United States. Soil Conservation Service36
- Struble, Richard A.25
- Pree, Henry L. (Henry Louis), 1917-18
- Stein, Russell B.10
- Guy, Donald E.8
- Crowell, Katie7
- Ohio. Division of Geological Survey7
- White, George W. (George Willard), 1903-19855
- Cummins, James W.4
- Hull, Dennis N. 1948-4
- Bownocker, J. A. 1865-19283
- Hansen, Michael C.3
- Hull, Dennis N.3
- National Geographic Society (U.S.)3
- Risser, Michele3
- Cowen, Clinton2
- Geological Survey (U.S.)2